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What Is Coronavirus?
health.howstuffworks.com/diseases-conditions/respiratory/corona-virus.htm
There are many types of coronaviruses. But more than a year has passed since a new strain — SARS-CoV-2 — emerged in China and rapidly spread across the globe, infecting more than 90 million and killing more than 2 million. What has — and hasn't — changed since then?
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